/Engine/Plugins/Runtime/Metasound/Source/MetasoundGraphCore/Public/MetasoundNodeInterface.h
FOutputDataSourceCollection contains multiple FOutputDataSources mapped by FNodeDataVertexKeys.
typedef [TMap](API\Runtime\Core\Containers\TMap)< [FNodeDataVertexKey](API\Plugins\MetasoundGraphCore\FNodeDataVertexKey), [FOutputDataSource](API\Plugins\MetasoundGraphCore\FOutputDataSource) > FOutputDataSourceCollection